Dental handpiece



Jan. 1, 1924- @ya 15gg. fr

Patented Jan. 1, 1924.

warte UNI-TED sir-Aras VVPA'rENT oFFlCE.

JOHN IMPEY, OF SAN FRANCISCO, CALIFORNI'EA.

DENTAL HANDPIECE.

Application led September 21, 1922. Serial No. 589,522.

This same movement with a reverse rotation to the operating stem iscarried out when' a new burr or implement is positioned within the handpiece.

' These operations are very objectionable in thatnit'requiresthe`,dentist to momentarily leaven vthe patient and necessitates theresterilizi'ng of thehands in further operations, thus considerable timeis lost, which is costly to the dentist and the patient.` l

The present invention relates to what may vloe termed a single handoperated dental hand piece, whereby the dentistV is enabled to grip thespindle pulley with the first and s eccnd lingers `and with the thumbinwardly press the operating stem when it is desired torelease animplement or burr from the chuck; lf ,the implements are held in acontainer with their chuckreceivingends outwardly disposed, by myinvention it is van .easy'matter to vpositionthe ,chuck over thedesired'implement. release ,the 'pressure on .the stem and vcontinue onwitlithe dental operation." rthis one hand operation overcomes thenecessity of the ydentist touching any implements lor tools with hisother hand, and `thus does not require that the other hand be`againsterilized for further work. f

By my present invention the work of changing the K`tools orimplementsused in a hand-piece is materially expediated and rthe loss'of time in sterilizing'the ,handsbetween .each change oftools iseliminated.

lith` the above mentioned other ob- `jects view, the invention consistsin the eevlcenetflltor .and combination of parts companying drawings andpointed out in the claims hereto appended; it being understood thatvariousA changes in the form, proportion, size and minor details ofconstruction within the scope of the claims may be resorted towithoutdeparting from the s irit or sacrificing any ofthe advantages 0 theinvention.

To more clearly comprehend the invention, reference is directed to theaccompanying drawings, wherein Y Fig. "l is a view in side elevation ofthe preferred embodiment of my invention.

Fig. 2 is a similar view 'with v,the sheath illustrated'in section,disclosing the spindle.

Fig. 3 is Va view in side elevation of the spindle, illustrating the'chuck yplunger operating lever anda portion of its operating bellcrank.

Fig. 4 is a longitudinal, central section illustrating the chuck, thechuck plunger,

the operating lever, bell Vcrank and toggle 'A link within the spindle,the partsbeing in ythe position to lock the implement stem within thechuck.

Fig. 5 is ,a view similarltolfig. fi with the parts in the position torelease the implement stem from the chuck. t d' Fig. 6 is a transversesectional view on the line 6-6 of Fig. 4.

Fig. 7 is an isometric view of the chuck plunger, chuck plungeroperating lever, bell crank, toggle'link and operating stem.

In the drawings, the numeral l indicates a conventional wrist jointframe to which is secured by a collar 2 bearing on a flange 8 theconventional well known tubular yhand piece sheath wfermed with acorrugated ,gripping portion 5 and a tapered terminal end 6. Within thesheath 4 is rotatably mounted a tubular spindle 7, rthe outer'surface ofwhich is tapered as at 8 within the upper' end of the bore 10. The chuckplunger engages the chuck to hold the same in closed position ingripping contact with the implement stem therein.

To actuate the chuck plunger 13, l mount a chuck plunger operating lever14 within the enlarged chamber 9 in the spindle, and the saine isvformed with what may be termed a laterally disposed hammer head 15received in a recess 16 in the lower end ot the slot 17 extendinglongitudinally oi' one wall of the spindle.

The surface 18 ot the lever is adapted to coact with the end of theplunger 13, as in the drawings, and with the tree end of said lever isadapted to coact the tree arm 19 of a bell crank 20, fulcrumed as at 21within the spindle and the opposite arm of which is connected through atoggle link 22 with the inner end of an operating stem 23. The stem 23is mounted for lineal reciprocating movement through the upper end ofthe sheath and projects upwardly beyond the conventional spindle pulley24, which is secured to the spindle to impart rotation thereto.

rlhe upper end of the operating stem is formed with a head 25 andsurrounding the stem between said head and spindle pulley is a coiledexpansion spring 26, which nor mally moves said stem outwardly tooperate the lever 14 to cause the end 18 thereof to engage the chuckplunger and operate the that hand ot the operator which he uses inworking on the patient. It will also be apparent that when the operatingstem is manually pressed inwardly, pressurekis released on lever 14 andon plunger 13 enabling the chuck to release the implement stern, andthat on the release ot inward pressure on the stem, the spring 26 forcesthe same outwardly applying pressure to the lever 14 andchuck plunger 13which engages the chuck 12 and thus securely locks the implement stemtherein.

Having thus described my invention, what l claim as new and desire tosecure by Letters Patent of the United States is:-

1. A dental hand-piece including a sheath, a hollow spindle rotatabletherein, an implement holding chuck in one end of said spindle andadapted for extending to release an implement, a lineally slidable stempro- `iecting axially from the other end of the spindle, an operatingconnection between the stem and chuck whereby on pressure Y being,applied to said stem said chuck will be operated to release and a springfor acting on said chuck through said stem to retain the implementlocked within the chuck on the release ot pressure on said stem.

2. A dental hand-piece including a sheath, a hollow spindle rotatabletherein, an implement holding chuck in one end orn said spindle, a stemmounted axially within and to rotate with said spindle and adapted torlineal reciprocating movement therein, a lever within the spindle andassociated with the chuck, a bell crank co-acting with the lever, a linkconnection between the stem and bell crank whereby said bell crank isoperated on the outward reciprocation of said stem to impart pressure tosaid lever and a spring for moving said stem outwardly on the release otpressure therefrom and for contracting said chuck.

3. A dental hand-piece including a hollow spindle, a sheath within whichthe spindle is rotatably mounted, a chuck in one end ot 'the spindle, alineally movable chuck operating stem projecting from the other end ofsaid spindle, said stem adapted on its inward lineal reciprocatingmovement to release said chuck, and means for operating said stem tolock said chuck in closed position.

4. A dental hand-piece including a hollow i spindle, a sheath withinwhich-the spindle is rotatably mounted, a chuck in one end of saidspindle, and associated instrumentalitiespwithin said spindle foroperating said chuck, said instrumentalities including a lineallyslidable operatingl'stem projecting axially from the kopposite end ofthe spindle and held from rotative movement therein and a springassociated with thestem for normally maintaining the chuck in closedposition. l

5. A dental hand-piece including a hollow spindle, a sheath within whichthe spindle is rotatably mounted, a chuck in oneend of said spindle, areciprocating chuck plunger, a reciprocating stem of the plunger typeextended axially from the opposite end of said spindle, co-actinginstrumentalities interposedwithin said spindle between said stem andchuck plunger 'for operation by reciprocation ot' said stem to releasesaid chuck plunger to permit the opening ot said chuck, and on theoutward reciprocation of said stem to apply pressure to said chuckplunger to cause the closingof said chuck and a spring for normallyoperating the stem to maintain a pressure on said chuck plunger. 4

6. A dental hand-piece including a hollow spindle, a sheath within whichthe spindle is rotatably mounted, a chuck in one end tended, zt leverfulcrumed Within said spingrip and release a tool by e lever, and means10 dle for bearing on said chuck plunger, and Within the handpiece foractuating the lever means associated with said stem and adaptincluding alinea-lly movable stem extended on an outward reciprocation of the steming at one end beyond the end of the hand by said spring to operate thesaid lever to piece opposite from that mounting the tool. apply pressurelongitudinally to said chuck In testimony whereof I have signed myplunger. name to this specication.

7. A belt driven dental engine hand piece l having a tool engagingclutch actuated to JOHN R. IMPEY.

